Install the apps. Note, for Windows, if you’re running vista or windows 7, make sure you install the app using xp compatibility mode. If you do not, your USB will be dead on the system until you manage to uninstall it. If you have a USB mouse / keyboard, you’re done.

Run irecovery -s from the command prompt. In OSX this is terminal and in Windows this is cmd.exe:

Type these commands. Wait about 2 seconds between each:

setenv auto-boot true
saveenv
fsboot

After the last command, 5 seconds will go by and your iPhone should reboot.